The quotes: Part of the problem with Facebook's advertising business is that its customers – advertisers – don't know what they are getting for their money. In separate articles posted today, the WSJ and CNET have all kinds of quotes from these people about their dissatisfaction:

WSJ: "The question with Facebook and many of the social media sites is, 'What are we getting for our dollars?'" said Michael Sprague, vice president of marketing at Kia Motors Corp.'s North American division.

CNET: David Smith, the CEO of digital agency Mediasmith: "Facebook just doesn't seem to care. They're still trying to grow this thing. The question is, do they want the big bucks?"

CNET: Mike Parker, the co-president of U.S. operations of Tribal DDB, talking about his frustration with Facebook: "For the longest time, we've been trying to call Facebook to do business with them and there's nobody to pick up the call," said Parker. "...They're very focused on the consumer experience, and less focused on revenue and working with advertisers."

WSJ: "There's a pretty high degree of animosity right now with Facebook because they have become so powerful," said Rob Griffin, global director of product development at Havas Digital, a unit of Havas

The ultimate problem: Facebook doesn't really have a great ad product to offer marketers.